.menu {
    background-image:url(/Sunlike/css/images/folder_go.png) !important
}

.menu-item {
    background-image:url(/Sunlike/css/images/preview.png) !important
}

.setting {
    background-image:url(/Sunlike/css/images/cog.png) !important
}

.treenode {
    background-image:url(/Sunlike/css/images/square_bullet.gif) !important
}